<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=478160
-->
<head>
  <title>Test for Bug 478160</title>
  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
  <style id="style" type="text/css"></style>
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=478160">Mozilla Bug 478160</a>
<p id="display"></p>
<div id="content" style="display: none">
  
</div>
<pre id="test">
<script type="application/javascript">

/** Test for Bug 478160 **/

var style_element = document.getElementById("style");
var style_text = document.createTextNode("");
style_element.appendChild(style_text);

function test_at_rule(str) {
    style_text.data = str;
    is(style_element.sheet.cssRules.length, 1,
       "should have one rule from " + str);
    var ser1 = style_element.sheet.cssRules[0].cssText;
    isnot(ser1, "", "should have non-empty rule from " + str);
    style_text.data = ser1;
    var ser2 = style_element.sheet.cssRules[0].cssText;
    is(ser2, ser1, "parse+serialize should be idempotent for " + str);
}

test_at_rule("@namespace 'a b'");

</script>
</pre>
</body>
</html>
